The sender and/or the reader will need to pay for longevity, somehow, somewhere.
Discussion
There is a heck of a lot of empty storage on remote servers, personal devices and USB sticks.
Idk, I only have about 1TB free to share ATM, which according to nostr:npub137c5pd8gmhhe0njtsgwjgunc5xjr2vmzvglkgqs5sjeh972gqqxqjak37w is practically useless